Mechanical, structural and thermodynamic features of high energy milled Cr3C2-25(Ni20Cr) composite powders

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dc.contributor.authorRAMANATHAN, L.V.
dc.contributor.authorCORREA, O.V.
dc.contributor.authorLIMA, N.B.
dc.contributor.authorCUNHA, C.A. da
dc.contributor.authorSAYEG, I.J.
dc.coverageNacionalpt_BR
dc.creator.eventoCONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23.pt_BR
dc.date.accessioned2019-02-11T16:08:41Z
dc.date.available2019-02-11T16:08:41Z
dc.date.evento04-08 de novembro, 2018pt_BR
dc.description.abstractThis paper presents mechanical, microstructural and thermodynamic features of Cr3C2-25(Ni20Cr) powders that were high energy milled for different times. Severe plastic deformation is introduced in the powders and a small part of the energy spent in the process is stored in the crystal lattice. Crystallite size, microstrain and lattice parameter of the powders were determined using x-ray diffraction measurements (Rietveld method). The evolution of microstrain with crystallite size revealed a critical crystallite size (DCRIT = 28 nm; tMill = 16 h), where the microstrain reached a maximum [?MAX (%) = 1.17], and then decreased. The lattice parameter showed an opposite behavior (aMIN = 3.5417A). This suggested occurrence of “size effects” and aspects related to strain gradient plasticity are discussed. Stored energy in the crystal lattice was determined from enthalpy variation of the powders, and the graph of ?H vs 1/D also showed a maximum (?HMAX = 722 mcal) for powders milled for 16 h. Microstructural features like small angle grain boundaries and microtwins where studied by TEM. The influence of grain boundaries on microstrain was studied. Modifications in microstructure are discussed based on dislocation density, which is related to crystallite size and microstrain in the crystal lattice. A model for dislocation density evolution has been suggested. The dislocation density at the critical crystallite size was around 1.7 x 1011 cm-2. The dimensions of the slip bands in the material were estimated (xMAX = 3.1 ?m).pt_BR
dc.event.siglaCBECiMatpt_BR
dc.format.extent2107-2107pt_BR
dc.identifier.citationRAMANATHAN, L.V.; CORREA, O.V.; LIMA, N.B.; CUNHA, C.A. da; SAYEG, I.J. Mechanical, structural and thermodynamic features of high energy milled Cr3C2-25(Ni20Cr) composite powders. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23., 04-08 de novembro, 2018, Foz do Iguaçu, PR. <b>Resumo...</b> p. 2107-2107. Disponível em: http://repositorio.ipen.br/handle/123456789/29516.
dc.identifier.orcidaguardandopt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-6444-9224
dc.identifier.orcidhttps://orcid.org/0000-0003-4822-8840
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/29516
dc.local.eventoFoz do Iguaçu, PRpt_BR
dc.rightsopenAccesspt_BR
dc.titleMechanical, structural and thermodynamic features of high energy milled Cr3C2-25(Ni20Cr) composite powderspt_BR
dc.typeResumo de eventos científicospt_BR
dspace.entity.typePublication
ipen.autorCECÍLIO ALVARES DA CUNHA
ipen.autorNELSON BATISTA DE LIMA
ipen.autorLALGUDI VENKATARAMAN RAMANATHAN
ipen.codigoautor6731
ipen.codigoautor550
ipen.codigoautor95
ipen.contributor.ipenauthorCECÍLIO ALVARES DA CUNHA
ipen.contributor.ipenauthorNELSON BATISTA DE LIMA
ipen.contributor.ipenauthorLALGUDI VENKATARAMAN RAMANATHAN
ipen.date.recebimento19-02pt_BR
ipen.event.datapadronizada2018pt_BR
ipen.identifier.ipendoc25300pt_BR
ipen.notas.internasResumopt_BR
ipen.type.genreResumo
relation.isAuthorOfPublication66599941-21f8-4ada-afc3-3b88064e4517
relation.isAuthorOfPublication92984f2d-b6bd-4cd9-950a-e1105bf78d83
relation.isAuthorOfPublication8e95d525-c559-413e-ac38-1e26a8fd67a3
relation.isAuthorOfPublication.latestForDiscovery8e95d525-c559-413e-ac38-1e26a8fd67a3
sigepi.autor.atividadeRAMANATHAN, L.V.:95:730:Spt_BR
sigepi.autor.atividadeLIMA, N.B.:550:730:Npt_BR
sigepi.autor.atividadeCUNHA, C.A. DA:6731:-1:Npt_BR
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